Abstract
Determination of hydrogen in steel by vacuum-fusion method is mostly desirable, because it becomes possible to determine simultaneously the gases in steel, but the results obtained by above technique tend to introduce lower values than those by conventional vacuum-heat method.
To investigate the sources of this difference this study was preformed in connection with physical and chemical properties of cabon-saturated melt contributed to hydrogen behavior and the following results were obtained.
1. Graphite precipitated from the melt affects the determined value in the sense that the greater the flaky form precipitate of graphite grows the greater the amount of hydrogen absorption is.
2. The loss of extracted hydrogen occurs slightly with the use of large size of graphite crucible.
3. Hydrogen absorption introduced by evaporated metal film is recognized for high alloying samples, but it does not result in a main cause of analytical error.It is, therefore, summarized that hydrogen determination by vacuum-fusion method is to be carried out by empty graphite crucible having small space with simultaneous additicn of spheroidal graphiteforming element.
